ABSTRACT
consider not only what should happen, but what does actually happen and how this can go wrong. He suggests that these questions will arise naturally as the analyst seeks to discover the indicators for success and failure of each of the subgoals. Annett (2004, pp. 68-69) states that the top-down systems approach taken by HTA enables the analyst “to identify and deal first with factors generating the largest error variance.” The error variance could be generated by either humans or machines, or an interaction between human and machines.
